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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Jun. 30, 2016
Deferred tax assets:    
Net operating loss carryforwards $ 75.5 $ 54.4
Property, plant and equipment 2.1 1.8
Accrued vacation 3.0 2.0
Allowance for doubtful accounts 9.7 2.4
Stock compensation expense 29.9 27.0
Research and development credits 9.9 9.4
Uncertain state tax positions 1.4 1.1
Other, net 2.3 0.7
Total gross deferred tax assets 133.8 98.8
Less valuation allowance (40.5) (35.6)
Total deferred tax assets 93.3 63.2
Deferred tax liabilities:    
Intangible assets 177.7 81.1
Total deferred tax liabilities 177.7 81.1
Net deferred tax liability $ (84.4) $ (17.9)